The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2020
Filed:
Sep. 10, 2014
Applicant:
Japan Vam & Poval Co., Ltd., Osaka, JP;
Inventors:
Akinobu Oharuda, Osaka, JP;
Masatoshi Kawanishi, Osaka, JP;
Assignee:
JAPAN VAM & POVAL CO., LTD., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41M 5/52 (2006.01); B41M 5/323 (2006.01); B41M 5/44 (2006.01); C08F 216/06 (2006.01); C09D 129/04 (2006.01); C08L 29/04 (2006.01); B41M 5/337 (2006.01); B41M 5/50 (2006.01);
U.S. Cl.
CPC ...
B41M 5/5254 (2013.01); B41M 5/323 (2013.01); B41M 5/3372 (2013.01); B41M 5/44 (2013.01); B41M 5/502 (2013.01); C08F 216/06 (2013.01); C08L 29/04 (2013.01); C09D 129/04 (2013.01); B41M 2205/04 (2013.01); B41M 2205/40 (2013.01); C08L 2201/54 (2013.01);
Abstract
Provided is a method for producing a polyvinyl alcohol resin, comprising the steps of copolymerizing an aliphatic vinyl ester (A) with diacetone acrylamide (B), at least a part of which diacetone acrylamide (B) is added at a later stage, in the presence of a polymerization catalyst in an alcohol solvent, so that the ratio (a)/(b) of the polymerization yield at the end of the polymerization (a) to the polymerization yield at the end of the later addition (b) of diacetone acrylamide (B) is in the range of 1.01 to 1.10, and saponifying the resulting copolymer.